$\frac{r^3}{r^2}$
$\left(y-1\right)\left(2x+y-2\right)=0$
$c2-6c-27$
$16\:x^2\:+\:7y^2\:-\:3\:-25x^2-1-12y^2$
$2\ln\left(3\right)+\ln\left(x-4\right)=\ln\left(3x\right)$
$\lim_{x\to-3}\frac{x^2+2x-3}{\left(x+3\right)^2}$
$5a\:-\:5a$
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